Try downloading it from either:
The CNET download on this website.
Or the Mediafire or MEGA alternative downloads located in the "Helpful Links" thread in General Discussion.
Confirm your not dropping packet somewhere and your actually getting the full file.
Also, make sure your Anti-Virus or firewall are not blocking the program from running because it was downloaded from an FTP link. Some do block file execution and consider FTP downloads to be "suspicous" from time to time.
